WARN Act Layoff Notice Deadline
Latest lawful notice date for a layoff — 60 calendar days under federal WARN, more under state mini-WARN.
Written and maintained by Paul Clark, Redmoon Software · Rules last verified · Sources
These calculators are for informational purposes only and do not constitute legal, financial, or professional advice.
How the WARN Act Layoff Notice Deadline works
The WARN Act Layoff Notice Deadline calculator works backward from a planned separation date to the last day written notice can lawfully go out. Enter the date you intend employment to end and the notice period that applies, and the tool returns the notice deadline. It counts backward rather than forward on purpose: in a real reduction the separation date is the fixed point that the business has already decided, and the question is whether the notice window is still open.
The count is in calendar days, and that is the detail this calculator exists to get right. Federal WARN requires 60 calendar days of advance written notice before a qualifying plant closing or mass layoff — the count does not skip weekends or public holidays, unlike almost every other deadline on this site. Because state mini-WARN statutes stack on top of the federal floor and several require substantially longer, the notice period is an input rather than a fixed 60. New York and New Jersey run 90 days; other states vary in both length and in the headcount thresholds that trigger them. Where more than one law applies, the controlling deadline is always the strictest, so set the field to the longest period any applicable statute imposes and work to that date.
What the tool computes is the date arithmetic, not the coverage question — and coverage is where most of the real analysis sits. Federal WARN reaches employers with 100 or more employees, and is triggered by a plant closing that costs 50 or more employees their jobs at a single site, or a mass layoff affecting 500 or more workers, or 50 to 499 workers where they make up at least a third of the active workforce at that site. State thresholds are frequently lower. There are also statutory exceptions that can shorten notice — the faltering company, unforeseeable business circumstances and natural disaster exceptions — which reduce the required period but do not eliminate the duty to give as much notice as is practicable along with a statement of the reason. None of that is modelled here. Get the coverage determination from counsel, then use this to hold the date.
Worked example
A closure is scheduled for Friday, 2 October 2026 and only federal WARN applies. Sixty calendar days back is Wednesday, 5 August 2026 — that is the last day notice can be delivered, and delivered means in the employees’ hands, not drafted. Now suppose the site is in New York, where the mini-WARN period is 90 days: the same 2 October separation pushes the notice deadline back to Saturday, 4 July 2026, two months earlier. Note where that lands — because the count is in calendar days it takes no account of whether the final day is a working one, and a deadline falling on a holiday weekend means the notice has to be in hand before it, not after. Setting the period to the strictest applicable statute is not a refinement; on this example it is the difference between a compliant closure and 90 days of back pay per employee.
Frequently asked questions
Does WARN count business days or calendar days?
Calendar days, which is unusual and worth stating plainly. Federal WARN requires 60 calendar days of advance notice, so weekends and public holidays are inside the window and do not extend it. A 60-business-day count would give roughly 84 calendar days and would badly overstate the runway you have. This calculator counts calendar days for exactly that reason.
Why does the tool count backward from the separation date?
Because that matches how a reduction in force actually gets planned. The business fixes the date employment ends, and the compliance question is whether notice can still be issued in time for it. Counting backward answers that directly: if the notice deadline the tool returns has already passed, the separation date has to move, not the notice. Counting forward from today only tells you the earliest date you could separate, which is the same arithmetic answering a question you are usually not asking.
What if a state mini-WARN law also applies?
Then the strictest applicable requirement governs, and you should set the notice period to the longest one. State statutes differ from federal WARN in period (New York and New Jersey run 90 days), in the employer size and headcount thresholds that trigger coverage, and sometimes in what the notice must contain and who must receive it. Federal WARN is a floor, not a ceiling — satisfying it does not satisfy a longer state law.
Is the 60 days business days or calendar days?
Calendar days. The count does not skip weekends or holidays, which is why a WARN notice period covers exactly 60 days of wall calendar regardless of when it starts. Several state mini-WARN statutes impose longer periods or lower employee thresholds, and where they do, the stricter rule governs.
What this calculator does not do
A limitation you know about costs far less than one you find after the deadline. These are the specific things this tool cannot work out for you.
- Sixty calendar days, not business days — the count does not skip weekends or holidays.
- Several states have their own mini-WARN statutes with longer notice periods, lower employee thresholds, or both. The stricter rule governs.
- The faltering-company, unforeseeable-business-circumstances and natural-disaster exceptions can shorten the period; the calculator does not apply them.
Where these rules come from
The periods this calculator applies are taken from the primary sources below rather than from secondary summaries. Verify against them before relying on a date that matters.
- 29 U.S.C. § 2102
The 60-calendar-day notice requirement before a plant closing or mass layoff.
- US Department of Labor — WARN Act